CN115268006A - Lens driving device, camera device, and electronic apparatus - Google Patents

Lens driving device, camera device, and electronic apparatus Download PDF

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Publication number
CN115268006A
CN115268006A CN202110399493.0A CN202110399493A CN115268006A CN 115268006 A CN115268006 A CN 115268006A CN 202110399493 A CN202110399493 A CN 202110399493A CN 115268006 A CN115268006 A CN 115268006A
Authority
CN
China
Prior art keywords
sliding surface
lens
driving device
lens driving
optical axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110399493.0A
Other languages
Chinese (zh)
Inventor
小野寺启
内藤和彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Shicoh Motor Co Ltd
Original Assignee
New Shicoh Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Shicoh Motor Co Ltd filed Critical New Shicoh Motor Co Ltd
Priority to CN202110399493.0A priority Critical patent/CN115268006A/en
Priority to US17/703,451 priority patent/US20220334403A1/en
Publication of CN115268006A publication Critical patent/CN115268006A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/001—Driving devices, e.g. vibrators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/005—Mechanical details, e.g. housings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/04—Constructional details

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)

Abstract

The invention provides a lens driving device, which realizes the low back of the lens driving device using a vibration component as a driving source without accompanying the rotation of a lens body. The lens driving device includes: a lens holding section having a holding section for holding the lens body and supported movably in an optical axis direction of the lens body; a drive shaft supported to extend in one direction orthogonal to the optical axis direction; a vibration member coupled to one end of the driving shaft to slightly vibrate the driving shaft; and a rectilinear cam mechanism portion supported by the drive shaft so as to be movable in the axial direction of the drive shaft. A1 st sliding surface is provided on the straight cam mechanism portion, and a 2 nd sliding surface is provided on the lens holding portion. Accordingly, the force acting in the axial direction of the rectilinear cam mechanism portion is converted into a force acting in the optical axis direction of the lens holding portion by the sliding of the 1 st sliding surface relative to the 2 nd sliding surface. The invention also provides a camera device and an electronic device.

Description

Lens driving device, camera device, and electronic apparatus
Technical Field
The present invention relates to a lens driving device used for an electronic device such as a smartphone or a monitoring camera, a camera device, and an electronic device.
Background
A lens driving device for AF (Auto Focus) using a piezoelectric element as a driving source moves a lens body intermittently at a fine pitch by expansion and contraction of the piezoelectric element. Patent document 1 discloses a technique that can contribute to the reduction in the height of an AF lens driving device that uses a piezoelectric element as a driving source. The driving device disclosed in patent document 1 is configured such that a male screw is provided on the inner periphery of a center hole of a guide member as a fixed body, a screw groove is provided on the outer periphery of a lens barrel as a movable body holding the lens body, the lens barrel is screwed into a hole of the guide member, and a piezoelectric element and a hammer are provided on a convex portion on the outer periphery of the lens barrel. In this driving device, when a voltage is applied to the piezoelectric element, the piezoelectric element expands and contracts in a tangential direction of the lens barrel to apply a micro-vibration to the lens barrel, and the lens barrel moves in an optical axis direction of the lens while rotating along a spiral of the screw.
Documents of the prior art
Patent document
Patent document 1 japanese patent application laid-open No. 2008-199755
Disclosure of Invention
Problems to be solved by the invention
However, in the case of the technique of patent document 1, there is a problem that the lens body rotates together with the movement of the lens barrel as a movable body along the optical axis direction.
In view of the above problems, an object of the present invention is to provide a lens driving device having a vibration member as a driving source, which can be reduced in height without accompanying rotation of a lens body.
Means for solving the problems
In order to solve the above problem, a lens driving device according to a preferred embodiment of the present invention includes: a lens holding section having a holding section for holding a lens body, the lens holding section being supported so as to be movable along an optical axis of the lens body; a drive shaft supported to extend in one direction orthogonal to the optical axis; a vibration member coupled to one end of the drive shaft to slightly vibrate the drive shaft; and a rectilinear cam mechanism portion supported by the drive shaft so as to be movable in an axial direction of the drive shaft, wherein a 1 st sliding surface is provided in the rectilinear cam mechanism portion, a 2 nd sliding surface is provided in the lens holding portion, and a force acting in the axial direction of the rectilinear cam mechanism portion is converted into a force acting in the optical axis direction of the lens holding portion by the 1 st sliding surface sliding against the 2 nd sliding surface.
In this aspect, a preload section may be provided for applying preload to the lens holding section along the optical axis direction.
Further, the optical lens device may include a guide shaft extending in the optical axis direction, and the lens holding portion may be provided with a guide hole through which the guide shaft passes.
The guide holes may be provided in two pieces with the 2 nd sliding surface interposed therebetween.
The pilot portion may be a coil spring, and the guide shaft may penetrate a hollow portion thereof.
At least one of the 1 st sliding surface and the 2 nd sliding surface may be a plane having a normal direction between the axial direction and the optical axis direction.
The other of the 1 st sliding surface and the 2 nd sliding surface may be a flat surface, and a normal direction of the 1 st sliding surface and a normal direction of the 2 nd sliding surface may be in the same direction and in opposite directions.
The other of the 1 st sliding surface and the 2 nd sliding surface may be a curved surface, and a normal direction of the 1 st sliding surface and a normal direction of the 2 nd sliding surface may be in the same direction and in opposite directions at positions where the 1 st sliding surface and the 2 nd sliding surface slide.
Further, a support shaft extending in the axial direction may be provided, and a support hole through which the support shaft passes may be provided in the rectilinear cam mechanism portion.
In the rectilinear cam mechanism portion, the projection portion having the 1 st sliding surface may project in the optical axis direction from an end portion on the lens holding portion side, and in the lens holding portion, the projection portion having the 2 nd sliding surface may project in the rectilinear cam mechanism portion side from an end portion on the rectilinear cam mechanism portion side.
Further, a pressing portion that presses the lens holding portion in the axial direction may be provided.
The pressing portion may include a magnet or a magnetic body provided in the lens holding portion, and a member provided to face the magnet or the magnetic body and applying an attractive force or a repulsive force to the magnet or the magnetic body, and the lens holding portion may be pressed toward the guide shaft extending in the optical axis direction by the attractive force or the repulsive force.
Further, the guide shafts may be provided in 2 numbers, one of the guide shafts may be provided at a position between the 2 nd sliding surface and the pressing portion, and the other guide shaft may be provided at a position along the axial direction opposite to the one guide shaft between which the 2 nd sliding surface is sandwiched.
Further comprising a position sensor, wherein the pressing part comprises: a magnet provided in the lens holding portion; and a magnetic plate provided to face the magnet, wherein the position sensor is located between the magnet and the magnetic plate, faces the magnet, and detects a magnetic field of the magnet.
A camera device according to another preferred embodiment of the present invention includes the lens driving device.
An electronic device according to another preferred embodiment of the present invention includes the camera device.
Effective fruit of the invention
The lens driving device of the invention comprises: a lens holding section having a holding section for holding a lens body, the lens holding section being supported so as to be movable along an optical axis of the lens body; a drive shaft supported to extend in one direction orthogonal to the optical axis; a vibration member coupled to one end of the drive shaft to slightly vibrate the drive shaft; and a rectilinear cam mechanism portion supported by the drive shaft so as to be movable in an axial direction of the drive shaft, wherein the rectilinear cam mechanism portion is provided with a 1 st sliding surface, the lens holding portion is provided with a 2 nd sliding surface, and a force acting in the axial direction of the rectilinear cam mechanism portion is converted into a force acting in the optical axis direction of the lens holding portion by the 1 st sliding surface sliding against the 2 nd sliding surface. In this case, since the force of the linear cam mechanism section acting in the axial direction is converted into the force of the lens holding section acting in the optical axis direction, the lens body does not rotate. This makes it possible to reduce the height of the lens driving device using the vibration member as a driving source without accompanying the rotation of the lens body.
Drawings
Fig. 1 is a front view of a smartphone 9 equipped with a camera device 8 including a lens drive device 5 according to an embodiment of the present invention.
Fig. 2 is a perspective view of the lens driving device 5 of fig. 1.
Fig. 3 is a perspective view of the lens driving device 5 of fig. 2.
Fig. 4 is a perspective view of a main part of the lens driving device 5 of fig. 2.
Fig. 5 is a perspective view of a main part of the lens driving device 5 of fig. 2 viewed from another angle.
Fig. 6 is a perspective view of a main part of a lens driving device 5 as another embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in fig. 1, a camera device 8 including a lens driving device 5 as one embodiment of the present invention is housed in a smartphone 9.
The camera device 8 has: a lens body 6; an image sensor 7 that converts light incident via the lens body 6 into an image signal; and a lens driving device 5 that holds the lens body 6 and the image sensor 7 and drives the lens body along the optical axis direction of the lens body 6 with respect to the image sensor 76.
Hereinafter, a direction in which light from an object enters is appropriately referred to as a Y direction, one direction orthogonal to the Y direction is appropriately referred to as an X direction, and a direction orthogonal to both the Y direction and the X direction is appropriately referred to as a Z direction. The object side in the optical axis direction of the lens body 6 is referred to as a front side, and the opposite side to the object side where the image sensor 7 is provided is referred to as a rear side. In addition, 2 directions orthogonal to the optical axis direction and orthogonal to each other are referred to as a left-right direction and a vertical direction, one side in the left-right direction is referred to as a left side, the other side is referred to as a right side, one side in the vertical direction is referred to as an upper side, and the other side is referred to as a lower side.
The lens driving device 5 includes a housing 10, a magnetic plate 15, a magnet 16, a lens holding portion 20, a guide shaft 31, a coil spring 32, a support shaft 37, a drive shaft 38, a rubber sleeve 39, a vibration member 40, an FPC 48, a base 50, a rectilinear cam mechanism portion 60, a spring member 70, and a support member 80.
The housing 10 has a box shape with one surface opened. A through hole 17 through which light from an object passes is provided in the center of the front plate 11 of the housing 10, and two fixing holes 18 are provided in parallel in the left-right direction around the through hole.
The base 50 has a rectangular rear plate 55, a 1 st pillar portion 51, a 2 nd pillar portion 52, and a 3 rd pillar portion 53 rising from the upper right side, the lower right side, and the lower left side corners of the rear plate 55, and a side plate 54 rising from the left side end edge of the rear plate 55. The 2 nd pillar portion 52 is offset slightly to the left from the right end. The 3 rd pillar portion 53 is provided slightly shifted to the right from the left end. A through hole 57 through which light from the subject transmitted through the lens body 6 passes is provided in the center of the rear plate 55.
The 1 st pillar portion 51, the 3 rd pillar portion 53, and the side plate 54 have substantially the same height. The height of the 2 nd pillar portion 52 is lower than the 1 st pillar portion 51, the 2 nd pillar portion 52, and the side plate 54. A rectangular recess 548 is provided in the outer surface of the side plate 54. An aperture 549 is provided in recess 548. A magnetic plate 15 is fixed to the inner surface of the side plate of the case 10. The 3 rd pillar portion 53 is provided with a fixing hole 537 and a circular hole 538. The fixing hole 537 and the circular hole 538 penetrate the 3 rd pillar portion 53 in the left-right direction.
A smooth front surface table portion 56 is provided between the 2 nd pillar portion 52 and the 3 rd pillar portion 53 of the rear plate 55 and the periphery of the through hole 57 (the table portion 56 on the 3 rd pillar portion 53 side is not shown). The table portion 56 is provided with a fixing hole 58.
The support member 80 has a rectangular parallelepiped shape having substantially the same size as the 3 rd pillar portion 53. A portion of the support member 80 including one corner is grooved as a recess 852. The support member 80 is provided with a fixing hole 837 and a circular hole 838. The fixing hole 837 and the circular hole 838 pass through the support member 80 in the left-right direction. The support member 80 is fixed to the rear plate 55 so that the recess 852 fits the 2 nd column part 52.
The rectilinear cam mechanism portion 60 has a substantially rectangular parallelepiped shape. The rectilinear cam mechanism portion 60 is provided with a support hole 637. The support hole 637 penetrates the rectilinear cam mechanism portion 60 in the left-right direction. The rectilinear cam mechanism portion 60 is inserted through the support shaft 37 at the support hole 637, and is supported and guided movably in the left-right direction as the axial direction of the support shaft 37. A flat surface portion 61 is provided at a lower end portion of the rectilinear cam mechanism portion 60. Two positioning projections 62 are provided on the flat surface portion 61.
On the rear surface of the rectilinear cam mechanism portion 60, a groove 69 and a projection 66 are provided. The groove 69 extends in the left-right direction and is grooved in a V-shape that opens to the rear side when viewed from the left-right direction. A projection 66 is provided on the upper side of the groove 69. One end surface of the projection 66 is a flat surface, and is a 1 st sliding surface 660. The normal direction of the 1 st sliding surface 660 is located between the axial direction of the drive shaft 38 and the optical axis direction, and is oriented to the rear right. The 1 st sliding surface 660 slides on the 2 nd sliding surface 260 of the lens holding portion 20.
The spring member 70 has a V-shaped portion as a whole, and is formed of two springs, i.e., an L-shaped V spring 71 and an L-shaped L spring 72. An L spring 72 is combined outside the V spring 71. A triangular gap 79 is provided between a V-shaped portion formed in the rear plate of the V spring 71 and the rear plate of the L spring 72. Two positioning holes 77 are provided in the lower plate of the L spring 72, and two positioning grooves 78 are provided in the lower plate of the V spring 71.
The V spring 71 is fitted into the positioning projection 62 of the flat surface portion 61 at the positioning groove 78, accommodates the V-shaped portion in the groove 69, and is fixed to the rectilinear cam mechanism portion 60. The lower plate of the L-spring 72 is fitted into the positioning projection 62 in the positioning hole 77 so as to be in close contact with the lower plate of the V-spring 71, and is fixed to the rectilinear cam mechanism portion 60. In the gap 79 of the spring element 70, the drive shaft 38 is passed through. The inner surface of the spring member 70 facing the gap 79 of the V spring 71 and the L spring 72 is frictionally engaged with the drive shaft 38.
The spring member 70 is provided with extension pieces 700 at the left and right end edges thereof forming the gap 79. The extension piece 700 is bent and protrudes so as to be separated from the drive shaft 38.
The lens holder 20 has a semicircular upper half portion and a rectangular lower half portion when viewed from the optical axis direction. The lens holding portion 20 is provided with a through hole 27 serving as a holding portion for holding the lens body 6. The lens body 6 is fitted into the through hole 27. The peripheral edge portion 22 surrounding the front side of the through hole 27 is raised forward relative to the periphery thereof, and the peripheral edge portion 23 on the rear side is raised rearward relative to the periphery thereof.
A guide hole 28 is provided at a lower left corner of the lens holding portion 20. The lower right corner of the lens holding portion 20 is a thin portion 24 thinner than the lower left corner, and a guide hole 28 is provided therein. The guide hole 28 penetrates the lens holder 20 in the optical axis direction. The right guide hole 28 is longer in the left-right direction than in the up-down direction.
On the left surface of the lens holding portion 20, there is a frame portion 25 protruding outward. The frame part 25 is shaped like a character' 12467. The magnet 16 is fitted and fixed in the frame 25. The magnet 16 faces a magnetic plate 15 fixed to the inner surface of the side plate of the case 10 as a fixed portion with a gap. The magnet 16 and the magnetic plate 15 constitute a pressing portion, and the lens holding portion 20 is pressed against the guide shaft 31 by the attractive force of the magnet 16 and the magnetic plate 15, thereby suppressing the lens holding portion 20 from tilting away from the guide shaft 31 when the lens holding portion 20 is moved in the optical axis direction.
The protrusion 26 protrudes downward through the two guide holes 28, 28 on the lower surface of the lens holding portion 20. The protrusion 26 has a trapezoidal shape. One end surface of the protrusion 26 is a flat surface and is a 2 nd sliding surface 260 having the same inclination as the 1 st sliding surface 660 of the protrusion 66 of the rectilinear cam mechanism portion 60. The normal direction of the 2 nd sliding surface 260 is the front left direction, and the normal direction of the 1 st sliding surface 660 is the same as the normal direction of the 2 nd sliding surface 260 but opposite thereto.
The lens holding portion 20 is supported by the guide shaft 31 and the coil spring 32 so as to be movable in the optical axis direction in a space between the front plate 11 of the housing 10 and the rear plate 55 of the base 50. The guide shaft 31 extends along the optical axis direction. The guide shaft 31 passes through the guide hole 28 of the lens holding portion 20. The left guide shaft 31 is positioned between the 2 nd sliding surface 260 and the pressing portion, and the right guide shaft 31 is provided at a position along the axial direction on the opposite side of the left guide shaft 31 with the 2 nd sliding surface 260 interposed therebetween. There is almost no gap between the guide shaft 31 on the left side and the guide hole 28. A gap is formed between the guide shaft 31 on the right side and the guide hole 28, particularly in the left-right direction. The lens holding portion 20 is pushed to the right side surface of the left guide shaft 31 by the attractive force of the pushing portion, and is pushed to the lower surface of the right guide shaft. The leading end portion of the guide shaft 31 is inserted into and fixed to the fixing hole 18 of the housing 10. The rear end portion of the guide shaft 31 is inserted into and fixed to the fixing hole 58 of the base 50. The coil spring 32 is provided in such a manner as to connect between the lens holding part 20 and the stage part 56, and the guide shaft 31 penetrates through a hollow part thereof. The coil spring 32 is a preload portion that applies preload in the optical axis direction with respect to the lens holder 20, and is a compression spring. The lens holding portion 20 is biased to the front side in advance by the coil spring 32.
The support shaft 37 and the drive shaft 38 extend in the left-right direction. The right end portion of the support shaft 37 is inserted into and fixed to the fixing hole 837 of the support member 80. The left end portion of the support shaft 37 is inserted into and fixed to the fixing hole 537 of the 3 rd pillar portion 53. The right end of the drive shaft 38 is inserted into and fixed to a rubber bush, not shown, and fitted into the rubber bush circular hole 838. The left end of the drive shaft 38 is penetrated through a rubber sleeve 39, and is coupled to a vibration member 40. The vibration member 40 is formed by laminating a 1 st piezoelectric element 41, an elastic thin plate 45, and a 2 nd piezoelectric element 42. The drive shaft 38 is fixed to the vibration member 40 by an adhesive 46. On the left surface of the vibration member 40, a pad 49 protruding downward from the main body of the FPC 48 is fixed. The rubber sleeve 39 is fitted into the circular hole 538 of the base 50. The body portion of the FPC 48 is bent in an L shape, and the right side is fitted into and fixed to the concave portion 548 of the base 50. At this time, the position sensor 481 provided on the right side of the FPC 48 is inserted into the hole 549. The position sensor 481 is located between the magnet 16 and the magnetic plate 15, and faces the magnet 16. The rear face extends from the rear end of the housing 10 outwardly towards the device. The magnet 16 stabilizes the lens holding portion 20 by an attractive force with the magnetic plate 15, and also operates as a position detecting magnet. The position sensor 481 detects a magnetic field from the magnet 16 and outputs a signal for controlling the optical axis position of the lens holder 20. Further, since the magnetic plate 15 operates as a yoke, the input magnetic field to the position sensor 481 can be increased. Further, since the lens holding part 20 is pressed against the guide shaft 31 by the attraction force between the magnet 16 and the magnetic plate 15, the distance between the magnet 16 and the position sensor 481 can be fixedly held, and stable position control can be achieved.
The support shaft 37 and the drive shaft 38 interposed between the support member 80 and the 3 rd pillar portion 53 allow the rectilinear cam mechanism portion 60 to be adjacent to the lower side of the lens holding portion 20 and to be supported movably in the axial direction of the drive shaft 38. The 1 st sliding surface 660 of the rectilinear cam mechanism portion 60 is in contact with the 2 nd sliding surface 260 of the lens holding portion 20.
When a predetermined pulse voltage is repeatedly applied from the FPC 48 to the piezoelectric element, the vibration member 40 is slightly deformed, and accordingly, the driving shaft 38 repeatedly performs a minute reciprocating asymmetric reciprocating motion. For example, the rectilinear cam mechanism unit 60 moves to the left while following the movement to the left when the drive shaft 38 is slowly moved to the left, and moves to the left while repeating the movement without following the movement but staying at the position when the drive shaft 38 is strongly moved to the right. When the reverse operation is performed, the rectilinear cam mechanism portion 60 moves to the right side with a gap.
When the rectilinear cam mechanism portion 60 moves to the right side, the 1 st sliding surface 660 of the rectilinear cam mechanism portion 60 slides to the right side with respect to the 2 nd sliding surface 260 of the lens holding portion 20, and a backward force is applied from the rectilinear cam mechanism portion 60 to the lens holding portion 20. With this force, the lens holding portion 20 moves to the rear side against the elastic force of the coil spring 32. When the rectilinear cam mechanism portion 60 moves to the left, the 1 st sliding surface 660 of the rectilinear cam mechanism portion 60 slides to the left with respect to the 2 nd sliding surface 260 of the lens holding portion 20, the force of the backward direction applied to the lens holding portion 20 from the rectilinear cam mechanism portion 60 becomes weak, and the biasing force of the coil spring 32 to the forward direction becomes dominant. With this force, the lens holding portion 20 moves to the front side by the elastic force of the coil spring 32.
The above is the details of the present embodiment. The lens driving device 5 of the present embodiment includes: a lens holding unit 20 having a holding unit for holding the lens body 6 and supported movably in the optical axis direction of the lens body 6; a drive shaft 38 supported to extend in one direction orthogonal to the optical axis direction; a vibration member 40 coupled to one end of the drive shaft 38 to slightly vibrate the drive shaft 38; and a rectilinear cam mechanism portion 60 supported by the drive shaft 38 so as to be movable in the axial direction of the drive shaft 38. The rectilinear cam mechanism portion 60 is provided with a 1 st sliding surface 660, and the lens holding portion 20 is provided with a 2 nd sliding surface 260. Accordingly, the force of the rectilinear cam mechanism portion 60 acting in the axial direction is converted into a force of the lens holding portion 20 acting in the optical axis direction by the sliding of the 1 st sliding surface 660 relative to the 2 nd sliding surface 260. Since the driving shaft 38 is disposed in the direction orthogonal to the optical axis direction, the height of the lens can be reduced, and in this case, the force for moving the rectilinear cam mechanism section 60 in the axial direction is converted into the force for moving the lens holding section 20 in the optical axis direction, so that the lens body 6 does not rotate. This makes it possible to reduce the height of the lens driving device 5 using the vibration member 40 as a driving source without accompanying the rotation of the lens body 6.
In the above embodiment, one of the 1 st sliding surface 660 and the 2 nd sliding surface 260 may be a curved surface. For example, as shown in fig. 6, the protrusion 66 may have a semicircular column shape, and the 1 st sliding surface 660 may have a semicircular curved shape. Further, the protrusion 26 may be semi-cylindrical. At this time, at the position where the 1 st sliding surface 660 and the 2 nd sliding surface 260 slide, the normal direction of the 1 st sliding surface 660 and the normal direction of the 2 nd sliding surface 260 are the same and opposite in direction.
In the above embodiment, the coil spring 32 may be an extension spring instead of a compression spring. The coil spring 32 may be provided between the housing 10 and the lens holding portion 20, and may be disposed in a hollow portion thereof so as not to pass through the guide shaft 31. Further, the prepressing portion may be not the coil spring 32, a plate spring may be used, or an attractive force or a repulsive force between magnets may be used by utilizing an attractive force between the magnets and the magnetic body. The vibration member 40 may be a so-called laminated type member in which a plurality of piezoelectric elements are laminated.
The shape of the left guide hole 28 and the shape of the right guide hole 28 may be reversed. The magnetic plate 15 may be provided to a fixed portion such as the side plate 54 of the base 50. The magnet 16 may be provided in the fixing portion and the magnetic plate 15 may be provided in the lens holding portion 20. Further, instead of the magnetic plate 15, another member such as the magnet of the 2 nd embodiment may be used. In this case, an attractive force may act between the magnet 16 and the 2 nd magnet, or a repulsive force may act. Although the above embodiment has been described as being mounted on the smartphone 9, the present invention may be applied to other electronic devices such as a monitoring camera.
Description of the symbols:
5 a lens driving device; 6 a lens body; 7 an image sensor; 8 a camera device; 9 a smart phone; 10 a shell; 11 a front plate; 15 a magnetic plate; 16 magnets; 17 through holes; 18 fixing holes; 20 a lens holding part; 22 a peripheral edge portion; 23 a peripheral edge portion; 24 a thin-walled portion; 25 frame parts; 26 a protrusion part; 27 through holes; 28 guiding holes; 31 a guide shaft; a 32-coil spring; 37 supporting the shaft; 38 a drive shaft; 39 a rubber sleeve; 40 a vibration member; 41 a 1 st piezoelectric element; 42 a 2 nd piezoelectric element; 45 an elastic sheet; 46 a binder; 48FPC;49 a pad portion; 50 a base; 51 a 1 st pillar portion; 52 a 2 nd pillar portion; 53 a 3 rd pillar part; 54 side plates; 55 a rear plate; a table portion 56; 57 a through hole; 58 fixing holes; 60 a straight cam mechanism part; a 61 plane part; 62 a positioning projection; 66 a protrusion; 69 grooves; 70 a spring member; a 71V spring; a 72L spring; 77 positioning holes; 78 positioning grooves; 79 gaps; 80 a support member; 260 nd sliding surface; 481 position sensor; 537 fixation holes; 538 circular holes; 548 a recess; 549 wells; 637 support holes; 660 first sliding surface; 700 an expansion sheet portion; 837 fixing holes; 838 round hole; 852 recess.

Claims (16)

1. A lens driving device is characterized by comprising:
a lens holding section having a holding section for holding a lens body and supported so as to be movable in an optical axis direction of the lens body;
a drive shaft supported to extend in one direction orthogonal to the optical axis;
a vibration member coupled to one end of the drive shaft to slightly vibrate the drive shaft; and
a straight cam mechanism portion supported by the drive shaft so as to be movable in an axial direction of the drive shaft,
the rectilinear cam mechanism portion is provided with a 1 st sliding surface, the lens holding portion is provided with a 2 nd sliding surface, and a force acting in the axial direction of the rectilinear cam mechanism portion is converted into a force acting in the optical axis direction of the lens holding portion by the 1 st sliding surface sliding with respect to the 2 nd sliding surface.
2. The lens driving device according to claim 1,
the optical lens driving device is provided with a prepressing part for applying prepressing to the lens holding part along the optical axis direction.
3. The lens driving device according to claim 2,
a guide shaft extending along the optical axis direction,
a guide hole is provided in the lens holding portion,
the guide shaft passes through the guide hole.
4. The lens driving device according to claim 3,
the guide holes are provided in two with the 2 nd sliding surface interposed therebetween.
5. The lens driving device according to claim 3,
the prepressing part is a coil spring, and the guide shaft penetrates through a hollow part of the prepressing part.
6. The lens driving device according to claim 1,
at least one of the 1 st sliding surface and the 2 nd sliding surface is a plane having a normal direction between the axial direction and the optical axis direction.
7. The lens driving device according to claim 6,
the other of the 1 st sliding surface and the 2 nd sliding surface is a flat surface, and a normal direction of the 1 st sliding surface and a normal direction of the 2 nd sliding surface are in the same direction and in opposite directions.
8. The lens driving device according to claim 6,
the other of the 1 st sliding surface and the 2 nd sliding surface is a curved surface, and a normal direction of the 1 st sliding surface and a normal direction of the 2 nd sliding surface are in the same direction and opposite directions at a position where the 1 st sliding surface and the 2 nd sliding surface slide.
9. The lens driving device according to claim 1,
a support shaft extending along the axial direction is provided,
a supporting hole is arranged on the straight cam mechanism part,
the support shaft passes through the support hole.
10. The lens driving device according to claim 1,
in the straight cam mechanism portion, a protrusion having the 1 st sliding surface protrudes in the optical axis direction from an end portion on the side of the lens holding portion,
in the lens holding portion, a protrusion having the 2 nd sliding surface protrudes from an end portion of the rectilinear cam mechanism portion side toward the rectilinear cam mechanism portion side.
11. The lens driving device according to claim 1,
the lens holder is provided with a pressing portion for pressing the lens holder in the axial direction.
12. The lens driving device according to claim 11,
the pressing portion includes: a magnet or a magnetic body provided in the lens holding portion; a member disposed opposite to the magnet or the magnetic body and applying an attractive force or a repulsive force to the magnet or the magnetic body,
the lens holding portion is urged by the attractive or repulsive force toward a guide shaft extending in the optical axis direction.
13. The lens driving device according to claim 12,
the guide shafts are provided in two, one of the guide shafts is provided at a position between the 2 nd sliding surface and the pressing portion, and the other guide shaft is provided at a position along the axial direction opposite to the one guide shaft with the 2 nd sliding surface interposed therebetween.
14. The lens driving device according to claim 12,
and a position sensor is also arranged on the device,
the pressing part is provided with a magnet arranged on the lens holding part and a magnetic plate arranged opposite to the magnet,
the position sensor is located between the magnet and the magnetic material plate, faces the magnet, and detects a magnetic field of the magnet.
15. A camera device comprising the lens driving device according to any one of claims 1 to 14.
16. An electronic device comprising the camera device according to claim 15.
CN202110399493.0A 2021-04-14 2021-04-14 Lens driving device, camera device, and electronic apparatus Pending CN115268006A (en)

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CN202110399493.0A CN115268006A (en) 2021-04-14 2021-04-14 Lens driving device, camera device, and electronic apparatus
US17/703,451 US20220334403A1 (en) 2021-04-14 2022-03-24 Lens driving device, camera device and electronic apparatus

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